Detailed Description

The MAX4734 is a low 0.8

Ω max (at V+ = 2.7V) on-

resistance, low-voltage, 4-channel CMOS analog multi-

plexer that operates from a 1.6V to 3.6V single supply.

CMOS switch construction allows switching analog sig-

nals that range from GND to V+.

When powered from a 2.7V supply, the 0.8

allows high continuous currents to be switched in a

variety of applications.

Applications Information

Proper power-supply sequencing is recommended for

all CMOS devices. Do not exceed the absolute maxi-

mum ratings, because stresses beyond the listed rat-

ings can cause permanent damage to the devices.

Always sequence V+ on first, followed by NO_ or COM.

Although it is not required, power-supply bypassing

improves noise margin and prevents switching noise

propagation from the V+ supply to other components.

A 0.1µF capacitor, connected from V+ to GND, is ade-

quate for most applications.

Logic Inputs

The MAX4734 logic inputs can be driven up to 3.6V

regardless of the supply voltage. For example, with a

1.8V supply, A_ and EN may be driven low to GND and

high to 3.6V. Driving A_ and EN rail-to-rail minimizes

power consumption.

Analog Signal Levels

Analog signals that range over the entire supply voltage

(V+ to GND) can be passed with very little change in on-

resistance (see Typical Operating Characteristics). The

switches are bidirectional, so the NO_ and COM_ pins

can be used as either inputs or outputs.

Layout

High-speed switches require proper layout and design

procedures for optimum performance. Reduce stray

inductance and capacitance by keeping traces short

and wide. Ensure that bypass capacitors are as close

to the device as possible. Use large ground planes

where possible.

0.8

Ω, Low-Voltage, 4-Channel

Analog Multiplexer

_______________________________________________________________________________________

7

50%

0

0

90%

90%

V+

GND

V+

A1

A0

EN

NO1

NO2–NO4

COM

MAX4734

35pF

V+

Figure 1. Switching Time

Test Circuits/Timing Diagrams